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Income Taxes - Schedule of Provision for Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Currently payable      
U.K. $ 0.7 $ 0.2 $ (0.2)
International 2.8 5.1 6.2
Total current taxes 3.5 5.3 6.0
Deferred      
U.K. 3.7 3.4 (0.1)
International (0.5) (3.2) (2.6)
Total deferred taxes 3.2 0.2 (2.7)
Total provision for income taxes $ 6.7 $ 5.5 $ 3.3